58 HELIX THELIDOMUS. 



with a plate-like white callus which is more or less notched at its 

 junction with the base, and is generally obtusely subdentate near its 

 insertion, sometimes bearing on its face a short carina of callus; 

 parietal callus very light. Alt. 20, diam. 24 mill. 



Porto Rico, St. Thomas, Tortola, St. Bartholemew, Anegada. 

 H. incerta FER., Hist, t. 105, f. 2. PFR., Symb., p. 37. (1841) 

 H. lima var. notabilis Fer., Hist., t. 46A, f. 4, 5. H. notabilis 

 SHUTT., Diag. neuer Moll., (6) p. 132. (1854). H. curvidens PFR,, 

 P. Z. S. 1854, p. 147. KEEVE, Conch Icon., f. 1360. IT. striolata 

 GUILDING, and alutacea ZGL. Mss. H. velutinoides Anton, Verzeich., 

 p, 36. (juv.) Otala ravnii BECK, Index, p. 36, teste Albers. 



This form was twice figured by Ferussac, and two names imposed. 

 The first description is that of Pfeiffer, in 1841, and applies to the 

 species as found subfossil, lacking cuticle and color. From H. lima 

 this species differs in being more elevated, never carinated when 

 adult, differently colored, etc. The spire is often abnormally 

 elevated. The fossil form (from St. Thomas) is often larger (28 

 mill, diam.) and sometimes subcarinated. Most or all of the Virgin 

 Islands, lying eastward from Porto Rico, are inhabited by this 

 species. 

 H. LIMA Ferussac. PL 1, figs 5, 6. 



Imperforate, depressed-conoidal, lusterless, yellowish, with ill-de- 

 fined oblique, narrow, chestnut, or umber streaks, the entire surface 

 except the upper whorls coarsely granulate, the granules lighter 

 than the ground-color ; spire conoidal, whorls slightly convex, apex 

 and inner whorls nearly smooth ; whorls 4 J, the last angular some- 

 times becoming rounded toward the aperture, transversely inflated, 

 decidedly deflected toward, the aperture ; aperture wide ; outer lip 

 expanded, baso-columellar lip subhorizontal, adnate, with a wide 

 callus plate within, which is truncate more or less at its base, and 

 bears about midway a strong tooth-like fold. 

 Alt. 19, diam. maj. 30, min. 24 mill. 



Porto Rico ; Vieque ; Curacao. 



H. lima FER., Hist., t. 46, f. 1, 2. PFEIFFER, Conchy 1. Cab., p. 

 55, t. 7, f. 13, 14. REEVE, Conch. Icon., f. 214. H.punctifera Lam. 

 DESH. Encyc. Meth., ii, p. 249. Otala asperula BECK, Index, p. 36. 

 H. castrensis PFR., P. Z. S. 1856, p. 386, and Novit. Conch, i, p. 

 109, t. 31, f. 3, 4. 



The present form is typically more carinated, more depressed, 



